Home / 20,920.19-28,862.78-11,961.36

Finding the Fourth Proportional to 20,920.19, 28,862.78 and 11,961.36

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Solution

The fourth proportional to 20,920.19, 28,862.78 and 11,961.36 is: 16,502.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.19 : 28,862.78 = 11,961.36 : x
  2. Step 2: Convert to fraction form
    20,920.19/28,862.78 = 11,961.36/x
  3. Step 3: Cross multiply
    20,920.19x = 28,862.78 × 11,961.36
  4. Step 4: Simplify right side
    20,920.19x = 345,238,042.37
  5. Step 5: Solve for x
    x = 345,238,042.37/20,920.19
  6. Step 6: Final answer
    x = 16,502.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.